docs: def validate_cmd_response_nonce(got, used):
      """
      Check that the returned nonce matches nonce used in request.
  
      A request nonce of 000000000000 means the HSM should generate a nonce internally though,
      so if 'used' is all zeros we actually check that 'got' does NOT match 'used'.
      """
      if used == '000000000000'.decode('hex'):
          if got == used:
              raise(pyhsm.exception.YHSM_Error("Bad nonce in response (got %s, expected HSM generated nonce)" \
                                                   % (got.encode('hex'))))
          return got
      return validate_cmd_response_str('nonce', got, used)